Elasticsearch 7：查询中使用 sort 进行排序


#Elasticsearch 笔记

按照字段值排序

创建索引：

PUT student
{
  "mappings" : {
    "properties" : {
      "name" : {
        "type" : "keyword"
      },
      "age" : {
        "type" : "integer"
      }
    }
  }
}

使用 _bulk 创建文档

POST _bulk
{ "index" : { "_index" : "student", "_id" : "1" } }
{ "name" : "张三", "age": 12}
{ "index" : { "_index" : "student", "_id" : "2" } }
{ "name" : "李四", "age": 10 }
{ "index" : { "_index" : "student", "_id" : "3" } }
{ "name" : "王五", "age": 11 }
{ "index" : { "_index" : "student", "_id" : "4" } }
{ "name" : "陈六", "age": 11 }

age 降序：

GET student/_search
{
  "query": {
    "match_all": {}
  }
  , 
  "sort": [
    {
      "age": { "order": "desc"}
    }
  ]
}

age降序，_id升序：

GET student/_search
{
  "query": {
    "match_all": {}
  }
  , 
  "sort": [
    {
      "age": { "order": "desc"}
    },
    {
      "_id": {"order" : "asc"}
    }
  ]
}

_id升序、age降序：

GET student/_search
{
  "query": {
    "match_all": {}
  }
  , 
  "sort": [
    {
      "_id": {"order" : "asc"}
    },
    {
      "age": { "order": "desc"}
    }
  ]
}

多字段值排序

如果某个字段是数组，也是可以排序的，不过需要指定 mode 。mode 支持 min、max、avg、sum。

# 删除之前建的 student
DELETE student
# 重建 student
PUT student
{
  "mappings" : {
    "properties" : {
      "name" : {
        "type" : "keyword"
      },
      "score" : {
        "type" : "integer"
      }
    }
  }
}

# 添加文档
POST _bulk
{ "index" : { "_index" : "student", "_id" : "1" } }
{ "name" : "张三", "score": [80, 90]}
{ "index" : { "_index" : "student", "_id" : "2" } }
{ "name" : "李四", "score": [78, 95] }

按照 score 的最小值排序：

# 请求
GET student/_search
{
  "query": {
    "match_all": {}
  },
  "sort": [
    {
      "score": {"order" : "asc", "mode": "min"}
    }
  ]
}

# 响应
{
  "took" : 16,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 2,
      "relation" : "eq"
    },
    "max_score" : null,
    "hits" : [
      {
        "_index" : "student",
        "_type" : "_doc",
        "_id" : "2",
        "_score" : null,
        "_source" : {
          "name" : "李四",
          "score" : [
            78,
            95
          ]
        },
        "sort" : [
          78
        ]
      },
      {
        "_index" : "student",
        "_type" : "_doc",
        "_id" : "1",
        "_score" : null,
        "_source" : {
          "name" : "张三",
          "score" : [
            80,
            90
          ]
        },
        "sort" : [
          80
        ]
      }
    ]
  }
}


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